1-carboxamidothio-3-aryl ureas

ABSTRACT

COMPOUNDS OF THE FORMULA   R-N(-R1)-CO-N(-R2)-S-N(-R3)-CO-R4   WHEREIN R IS PHENYL SUBSTITUTED WITH 0 TO 4 HALOGENS, NITRO GROUPS, LOWER ALKYL OR LOWER ALKOXY GROUPS; R1 AND R2 ARE HYDROGEN OR LOWER ALKYL OF 1 TO 10 CARBON ATOMS OPTIONALLYY SUSBSTITITED WITH HALOGEN ATOMS OR CYCLOALKYL OF 3 TO 10 CARBON ATOMS OPTIONALLY SUBSTITUTED WITH HALOGEN ATOMS; R4 IS HYDROGEN, ALKY OF 1 TO 10 CARBON ATOMS OPTIONALLY SUBSTITITED WITH HALOGEN ATOMS, CYCLOALKYL OF 3 TO 10 CARBON ATOMS OPTIONALLY SUBSTITUTED WITH HALOGEN ATOMS, WITH THE PROVISO THAT R3 AND R4 MAY BE JOINED TO FORM A LINEAR ALKYLENE RADICAL OF 3 TO 5 CARBOON ATOOS WHICH IS BOUND TO THE CARBONYL AND NITROGEN TO FORM A RING. THE COMPOUNDS ARE HERBICIDAL.

United States Patent US. Cl. 260-545 R 13 Claims ABSTRACT OF THE DESCLOSURE Compounds of the formula wherein R is phenyl substituted with O to 4 halogens, nitro groups, lower alkyl or lower alkoxy groups; R and R are hydrogen or lower alkyl; R is alkyl of 1 to 10 carbon atoms optionally substituted with halogen atoms or cycloalkyl of 3 to 10 carbon atoms optionally substituted with halogen atoms; R is hydrogen, alkyl of 1 to 10 carbon atoms optionally substituted with halogen atoms, cycloalkyl of 3 to 10 carbon atoms optionally substituted With halogen atoms, with the proviso that R and R may be joined to form a linear alkylene radical of 3 to 5 carbon atoms which is bound to the carbonyl and nitrogen to form a ring. The compounds are herbicidal.

FIELD OF THE INVENTION This invention is directed to novel ureas and their use as herbicides. More particularly, it concerns l-(N-alkylcarboxamidothio)-3-phenyl ureas and their use as herbicides.

DESCRIPTION OF THE INVENTION The ureas of this invention may be represented by the formula wherein R is phenyl or phenyl substituted with 1 to 4 halogen atoms of atomic number 9 to 35 (fluorine, chlorine or bromine), nitro groups, alkyl groups individually of 1 to 4 carbon atoms or alkoxy groups individually of 1 to 4 carbon atoms; R i hydrogen or alkyl of 1 to 4 carbon atoms; R is hydrogen or alkyl of 1 to 4 carbon atoms; R is alkyl of l to 10 carbon atoms, alkyl of l to 10 carbon atoms substituted with 1 to 4 halogen atoms of atomic number 17 to (chlorine or bromine), cycloalkyl of 3 to 10 carbon atoms or cycloalkyl of 3 to 10 carbon atoms substituted with 1 to 4 halogen atoms of atomic number 17 to 35; R is hydrogen, alkyl of 1 to 10 carbon atoms, alkyl of 1 to 10 carbon atoms substituted with 1 to 4 halogen atoms of atomic number 17 to 35, cycloalkyl of 3 to 10 carbon atoms or cycloalkyl of 3 to 10 carbon atoms substituted with 1 to 4 halogen atoms of atomic number 17 to 35, with the proviso that l" R and R may be joined to form a linear alkylene rad1cal 3,824,281 Patented July 16, 1974 of 3 to 5 carbon atoms which is bound to the carbonyl and nitrogen to form a ring.

Preferably R is phenyl or phenyl substituted with 1 to 4 halogen atoms of atomic number 9 to 35 or nitro groups, more preferably 1 to 2 halogen atoms of atomic number 9 to 35 or nitro groups. When R is phenyl substituted with alkyl or alkoxy, it is preferred that the alkyl or alkoxy substituents be in position 2, 4 or 6 of the benzene nucleus.

R is preferably hydrogen or alkyl of 1 to 2 carbon atoms, more preferably methyl. R is preferably alkyl of 1 to 2 carbon atoms.

R is preferably alkyl of 1 to 6 carbon atoms, alkyl of 1 to 6 carbon atoms substituted with 1 to 4 halogen atoms of atomic number 17 to 35, preferably 1 to 2 halogen atoms of atomic number 17 to 35, cycloalkyl of 3 to 6 carbon atoms or cycloalkyl of 3 to 6 carbon atoms substituted with 1 to 4 halogen atoms of atomic number 17 to 35, preferably 1 to 2 halogen atoms of atomic number 17 to 35. Still more preferably, R is alkyl of l to 4 carbon atoms substituted with O to 2 halogen atoms of atomic number 17 to 35, preferably chlorine.

R is preferably hydrogen, alkyl of 1 to 6 carbon atoms, alkyl of 1 to 6 carbon atoms substituted with 1 to 4 halogen atoms of atomic number 17 to 35, preferably 1 to 2 halogen atoms of atomic number 17 to 35, cycloalkyl of 3 to 6 carbon atoms or cycloalkyl of 3 to 6 carbon atoms substituted With 1 to 4 halogen atoms of atomic number 17 to 35, preferably 1 to 2 halogen atoms of atomic number 17 to 35. More preferably, R is hydrogen or alkyl of 1 to 4 carbon atoms, still more preferably 1 to 3 carbon atoms, substituted with 0 to 2 halogen atoms of atomic number 17 to 35, preferably chlorine,'

or cycloalkyl of 3 to 6 carbon atoms, preferably cyclohexyl, substituted with O to 2 halogen atom of atomic number 17 to 35.

R and R may be joined to form a linear alkylene radical of 3 to 5 carbon atoms which is bound to the carbonyl and nitrogen to form a ring. Preferably the linear alkylene radical will contain 3 carbon atoms.

Representative groups which R may represent include phenyl, o-fluorophenyl, p-fluorophenyl, m-chlorophenyl, o-fluoro-p-bromophenyl, o-methylphenyl, p-ethylphenyl, p-methoxyphenyl, m-butoxypheny'l, p-nitrophenyl, 0- nitro-p-methoxyphenyl.

Representative alkyl groups which R and R may represent include methyl, ethyl, n-propyl, isopropyl, nbutyl and isobutyl.

Representative groups which R and R may represent include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, Z-methylbutyl, B-methylpentyl, cyclopentyl, cyclohexyl, cyclooctyl, chloromethyl, 2-chloroethyl, 3-chloropropyl, 4- chloroamyl, 6-chlorohexyl, 2,6-dichlorocyclohexyl, 2,6- dibromocyclohexyl, 3-bromocyclohexyl, bromoethyl, 2- bromoethyl, 3-bromopropyl, etc.

Alkyl radicals which R and R taken together may represent are propylene, butylene and amylene.

Typical ureas of the present invention include 1-methyl- 1- (N-methylformamidothio -3-ofluorophenyl urea, l-methyl- 1- (N-methylacetamidothio) -3-0-chlorophenyl urea, l-methyl- 1- (N-methylpropionamidothio -3-p-chlorophenyl urea,

l-methyl- 1- (N-methylbutyramidothio) -3-m-bromophenyl urea,

1-methyl-1-(N-methylvaleramidothio)-3-o-methylphenyl urea,

l-methyl-l-(N-methylcyclohexylcarboxamidothio)-3-0- methoxyphenyl urea,

l-methyl-l-(N-ethyl-3,4,S-trichlorovaleramidothio)-3-ppropylphenyl urea,

l-ethyl- 1- (N-methylformamidothio -3-0-fluoro-pbromophenyl urea,

l-butyl- 1- (N-ethylformamidothio -3-p-ethoxyphenyl urea,

l-methyl- 1- (N-propylacetamidothio) -3-m-nitro-pbromophenyl urea,

l-methyl- 1- (N-methylcaproamidothio -3-0-fluorophenyl urea,

l-methyl-l-(N-methyl-Z-chlorocyclopentylcarboxamidothio)-3-pheny1 urea,

l-ethyl- 1- (N-cyclohexylformamidothio -3-m-chlorophenyl urea,

l-methyl-1-(N-chloromethylacetamidothio)-3-(2- chloro-S-fluorophenyl) urea.

The ureas of the present invention may be prepared by reacting a urea with an acylamido sulfenyl chloride according to the following equation:

wherein R, R R R and R are as previously defined. This reaction may be carried out in pyridine, dimethyl forrnamide with or without an acid acceptor or in other solvents such as methylene chloride, chloroform, acetonitrile and dimethoxyethane using an acid acceptor. Acid acceptors which may be used with dimethyl formamide and these other solvents are pyridine, alkylpyridines, quinoline and similar heterocyclic bases. Pyridine is a preferred acid acceptor. When pyridine is used alone it acts both as a solvent and acid acceptor. The preferred medium for carrying out this reaction is methylene chloride with pyridine as an acid acceptor.

The pressures and temperatures at which the reaction is carried out are not critical. Thus temperatures ranging r from ambient to about 60 C. will normally be used. However, lower temperatures or higher temperatures up to the decomposition temperature of the reactants and product may be used. The pressure will generally be atmospheric or autogenous. The reaction will normally be complete within 30 minutes to 4 hours.

The urea reactant in the above equation may be prepared in situ or beforehand. Conventional methods such as reacting an amine with an isocyanate may be used to prepare this reactant.

The acylamido sulfenyl chloride reactant may be prepared by reacting sulfur dichloride with a monoalkylated amide or lactam. This reaction is illustrated by the following equation:

wherein R and R are as previously defined. It is desirable to use stoichiometric proportions of the reactants or an excess of sulfur dichloride reactant up to about 4:1 mole ratio.

The reaction temperature in general is not critical and will usually be in the range of 50 to C., preferably 20 to 60 C. Likewise the pressure is not critical and will usually be atmospheric or autogenous. Reaction time will generally be from hour to 5 hours.

The reaction will generally be carried out in the presence of an inert solvent such as dichloromethane, diethylether, tetrahydrofuran, dimethylformamide, dioxane, acetonitrile, and the like. Generally each of the reactants will be admixed separately with a solvent and then the mixture containing the amide and preferably a hydrogen halide acceptor will be added slowly with stirring to the mixture containing the sulfur dischloride. The amount of solvent should be equal to or up to five times the weight of the sulfur dichloride. Likewise the solvent for the amide-halide acceptor mixture should be equal to or up to five times the weight of both.

The sulfur dichloride should be added in high purity, for example greater than 98% purity. It is frequently desirable to have a small amount of an inhibitor such as tributyl phosphate or triethylphosphate present with the sulfur dichloride in order to maintain the high purity.

The reaction is preferably carried out in the presence of a mild hydrogen halide acceptor. At least stoichio metric amounts of acceptor should be used. Soluble tertiary amines such as pyridine and trialkylamines, e.g., triethylamine and tributylamine are preferred.

The acylamido sulfenyl chloride can generally be recovered from the reaction mixture by stripping any excess sulfur dichloride, filtering off the salt formed between the hydrogen halide acceptor and the HCl, evaporating the solvent and the product purified as by distillation or recrystallization.

EXAMPLES The following examples illustrate methods used to prepare the ureas of the present invention. These examples are in no way intended to limit the invention described herein. Unless otherwise indicated, percentages are by weight.

Example l.1-methyl-1-(N-methylformamidothio)- 3-'(2-fluorophenyl) urea 12.5 g. of N-methylformamido sulfenyl chloride in 20 ml. of methylene chloride was added slowly to a slurry of 16 g. of 1-methyl-3-(2-fluorophenyl) urea and 9 ml. of pyridine in ml. of methylene chloride with a slight exothermicity. The reaction mixture was stirred one hour at room temperature, washed with water then with aqueous sodium bicarbonate and again with water. After being dried over magnesium sulfate the product solution was stripped of solvent under vacuum and the residual oil was chromatographed on a column of silica gel eluting with ether. A portion of the chromatographed product was recrystallized from benzene-hexane. The product melted at 65-69" C. and had the following elemental analysis:

Calculated (percent): S, 12.45; F, 7.40. Found (percent): S, 12.92; F, 7.64.

Example 2.1-methyl-1-(N-methylformamidothio)-3- (3,4-dichlorophenyl) urea 14 g. of N-methylformamido sulfenyl chloride diluted with 10 ml. of methylene chloride was added slowly from a dropping funnel to 20 g. 'of 1-methyl-3-(3,4-dichlorophenyl) urea and 10 ml. of pyridine in 200 ml. methylene chloride in a 500 ml. three-necked flask equipped with mechanical stirrer. After addition Was complete the reaction mixture was stirred for 2 hours at room temperature, diluted with 200 ml. methylene chloride, washed with 200 ml. of water, then with 200 ml. aqueous sodium bicarbonate solution and again with 200 ml. of water. After drying and solvent removal under vacuum the crude product was chromatographed on a column of silica gel eluting with ether. The product was further purified by 6 UTILITY The ureas of the present invention are, in general, herbicidal in both preand post-emergence applications. For pre-en1ergence control of undesirable vegetation these ureas will be applied in herbicidal quantities to the environment, e.g., soil infested with seeds and/or seedlings of such vegetation. Such application will inhibit the growth of or kill the seeds, germinating seeds and seed- TABLE I lings. For post-emergence applications the ureas of the 1 10 present invention will be a lied directl to the foliage Element ana yses PP Y S H l 6 e and other plant parts. Generally they are efiecnve agamst ii weed grasses as well as broadleaved weeds. Some ma be point, y Compflund @8101 Found Calc- Found selectlve with respect to type of application and/or type 1-meghy1lu-1-)(I 3I-(1;1egiylforrna F of Weedd h b d 1 mi 0t i0 0 1' an ost-e er en e i s s n e re entaphenyl)urea 11.70 12.55 12.98 13.48 011 P e n} g r w t l-metihyllll3flgl-(rlietltrylformat1ve urefitsdo t 1s invention were ma e using 1 e o owmi 0 ingmet o s: phcnyl) urea 11. 25 10. 95 '19. 70 19. 05 115-118 hethgl-tlfitbg-ntlingifofina- Pre-Emergence Test mo1o--,-cor0- phcnyl) urea 9.83 10.40 22.1 22.70 68-72 An acetone solution of the test ureas was prepared by mixing 750 mg. urea, 220 mg. of a nonionic surfactant bromophenyl) urea 9.07 9.35 5,5 5.40 0 and ml. of acetone. This solution was added to apfi g i f gg' gggggggg proximately 125 ml. of water containing 156 mg. of sururea 12. 7 12. 90 '10. 0 15. 95 011 factant.

25 Seeds of the test vegetation were planted 1n a pot of phenyl) areal 0.97 0. 68 21. 75 21.70 111-113 soil and the urea solution was sprayed uniformly onto the soil surface at a dose of 100 micrograms per cm The fluorophcnyl) urea 11.85 11. 59 7.01 7. 23 4- pot was watered and placed in a greenhouse. The pot was T watered lntermittently and was observed for seedling acatamltlothro)-3-(4- 51.1510 1111111111) urea 11.15 10. 05 12.33 12.18 92-91 emergence, health of emergms s em o a g g g g g gi lh week period. At the end of this period the herbicldal efphenyl) urea 10.77 10. 18.8 18.1 119-125 fectiveness of the urea was rated based on the physiologi- 'g f fi g gggf cal observations. A 0 to 100 scale was used; 0 representphonyDurea 11.84 11.88 15.5 '15. 13 79-82 ing n0 phytotoxicity, 100 representing complete kill. heatr -t e tr- -5 0 1O -l]1 I'Op any 0 urea 10. 77 10.51 18.8 10.3 105-110 Post Emergence Test The test urea was formulated in the same manner as fiuorophenyl) urea 10.72 10.95 011 described above for the pre-emergence test. The concen- 'm t i tration of the urea in this formulation was 5000 .p.m.

butyramrdothio) 3-(4 p nitrophenyl) urea 0.84 9.77 17.3 17.08 119-121 40 ,Th1s formulation was uniformly sprayed on 2 replicate pots of 24-day-old plants (approximately 15 to 25 plants (2-flu0i'opli3nyl) 11e18.--1 9.40 9. 40 5.0 5.50 on per pot) at a dose of 100 microgram per cm. After the i fggfi gig fig zfgj plants had dried, they were placed. in a greenhouse and (l-IliijfDDhGIll/l) urea 8.77 s. 70 15.2 15.05 127-135 then watered intermittently at their bases as needed. The i fl lants were observed eriodicall for ph totoxic effects butyram1d0th1o)-3-(3- p p y y nitrophenyl) urea 9.82 9.86 '17. 18 10.40 011 and physiological and morphological responses to the 'g g ggfi fifgi gg fg treatment. After 3 weeks the herbicidal effectiveness of phenyl) urea 11.24 11.38 011 the urea was rated based on these observations. A 0 to 1-(N-methylformamidothio)- 3 pheny1uma 14 21 4 40 5 0 40. 3 r 100 Scale: was 0 Tepresennng no P Y Y, 100 o0 representing complete kill.

Nltmgen- The results of these tests appear in Table II.

TABLE II Herblcidal eflectiveness, pre/post Compound 0 W C M P L l-rncthyl-l-(N-methylforrnan1idothio)-3-(Z-fiuorophenyl) urea 98/100 100/100 100/100 100/100 100/100 100/100 l-methyl-l-(N-methylformamidothio) -3-(2-ch1or0phenyl) urea 1 100/100 93/100 90/100 100/100 100/100 100/100 1-1nethyl-1-(N-methylformarnidothio)-3-(3,4dichl0r0phenyl) urea 90/100 100/100 100/100 100/100 100/100 100/100 l-methyH-(N-methylformamidothio)-3-(4-nitrophenyl) urea 75/70 80/70 100/8 l-ethyl-l-(N-methylf0rmamidothio)-3-(3,4-dichlorophenyl) urea /100 /100 00/100 95/100 100/100 100/100 l-methyl-l-(N-methylformamldothlo) -(Eichloro--bromophenyl) urea- /100 100/100 100/100 100/100 100/100 100/100 i tfi iii" ii i t ?i B "1057155 1539166 11 183138 158%38 153%?13 e y 1118' yace 3.1111 0 l0 100/100 100/100 100/100 100/100 100/100 100 100 05/90 05/- /100 100/100 100 100 100/100 100/100 100/100 l-methyl-l-(N-methylbutyrarnidothio)-3-(4-nitrophenyl) urea 95/ 9 70/ l-methyl-l-(N-rnethyleyclohexylcarboxamidothio)3-(2-fluoropl1enyl) urea 100/100 100/100 100/100 100/100 100/100 100/100 l-rnethyl-l-(N-methylbutyramidothio)-3-(3nitr0phenyl) urea 70/ 8 75/- 97/80 83/- 03/- l-methyl'l-(N-rnethylpropylamidothi0)-3-(2-fiu0r0phenyl) urea. 100/100 100/100 100/100 100/100 100/100 100/100 1-(N-methylformamidothio)-3-pl1enyl urea 66/- 85/ 70/ Norn.0 =Wild oats (Arena fatua). W=Watsrgrass (Echinochlna crusgallz'). C=Crabgrass (Digitarz'a sanguznalis). M=Mustard (Brassica arvensis). P=Pigwoed (Amanmthus retro/10x00). L=Lambsquarter (Chcnopodimn. album).

The amount of urea administered will vary with the particular plant part or plant growth medium which is to be contacted, the general location of application, i.e., sheltered areas such as greenhouses as compared to exposed areas such as fields, as Well as the desired type of control. For pre-emergent control of most plants dosages in the range of about 0.5 to 20 lbs. per acre will be used. Such administration will give a concentration of about 2 to 80 ppm. urea distributed throughout 0.1 acre-foot. For post-emergence application, such as foliar spray application, compositions containing about 0.5 to 8 lbs. urea per 100 gal. spray will be used. Such application is equivalent to about 0.5 to 20 lbs. urea per acre.

The herbicidal compositions of this invention comprise a herbicidal amount of one or more of the above described ureas intimately admixed with a biologically inert carrier. The carrier may be a liquid diluent such as Water or acetone or a solid. The solid may be in the form of dust powder or granules. These compositions will also usually contain adjnvants such as a wetting or dispersing agent to facilitate their penetration into the plant growth media or plant tissue and generally enhance their eifectiveness. These compositions may also contain other pesticides, stabilizers, conditioners, fillers and the like.

Some of the compounds of the present invention also exhibit algicidal activity. The test procedure is as follows:

An acetone solution of equal parts of urea and a surfactant was prepared. This solution was mixed with a nutrient broth in a quantity sufficient to give a concentration of 2 ppm. urea. Four replicate 150 ml. specimen cups were filled with this mixture. 350-400 mg. of Euglena was added to each specimen cup and the cups were then placed in an environment chamber for incubation. The cups were observed periodically for algae growth. The algicidal eflectiveness of the urea was determined based on a final observation of algae growth after 10 days.

The results of these tests, reported as the average of the 4 replicates on a to 100 basis-O indicating no effectiveness; 100 indicating complete effectiveness-are reported in Table III.

TABLE III Compound: Euglena, Percent Control 1 methyl 1 (N methylformamidothio)-3-(2- fiuorophenyl) urea 100 1 methyl 1 (N-methylformamidothio)-3(3,4-

dichlorophenyl) urea 100 1 ethyl 1 (N methylformamidothio)-3-(3,4-

dichlorophenyl) urea 100 1 methyl 1 (N met hylformamidothio)3-(3- chloro-4-bromophenyl) urea 100 1 methyl 1 (N methylacetamidothio)-3-(3,4-

dichlorophenyl) urea 100 1 methyl 1 (N-methylcyclohexylcarboxamidothio)-3-(2-fluorophenyl) urea 100 Ureas of this invention when used for controlling microbiological organisms suoh as algae can be applied to such organisms in aqueous bodies such as lakes, streams, canals, pools and the like. Generally a biocidal quantity of one or more of the ureas of this invention is added to the aqueous growth environment of the organisms. Usually this dosage will range from 0.1 to 500 p.p-.m. In any given instance, the optimum dosage will depend upon the particular organism and aqueous body involved. Preferably the amount employed will range from 0.1 to ppm. In terms of pounds of urea per acre of water one foot deep 0.1 to 10 ppm. is equal to about 0.3 to lbs. per acre of water one foot deep. The ureas may be applied as dispersible powders or in solutions with water-miscible solvents. Preferred ureas for control of algae have halogen substituted phenyl groups (R in the formula of the compound).

Some of the ureas of this invention were also used to control fungi such as lllonolinia fructicola, Alternaria salami, etc. When used as fungicides the ureas will be formulated and applied in fungicidal amounts by conventional art methods to fungi or hosts which are subject to fungus attack, especially vegetative hosts such as plants, plant seeds, paper and the like. They may be combined with inert liquids and solid carriers as powders, solutions or dispersions for such use.

As will be evident to those skilled in the art, various modifications on this invention can be made or followed, in the light of the foregoing disclosure and discussion, without departing from the spirit or scope of the disclosure or from the scope of the following claims.

CLAIMS 1. Compound of the formula 0 O RN JN- S N (HJR4 wherein R is phenyl or phenyl substituted with 1 to 4 halogen atoms of atomic number 9 to 35 (fluorine, chlorine or bromine), nitro groups, alkyl groups individually of 1 to 4 carbon atoms or alkoxy groups individually of 1 to 4 carbon atoms; R is hydrogen or alkyl of 1 to 4 carbon atoms; R is hydrogen or alkyl of 1 to 4 carbon atoms; R is alkyl of 1 to 10 carbon atoms, alkyl of 1 to 10 carbon atoms substituted with 1 to 4 halogen atoms of atomic number 17 to 35 (chlorine or bromine), cycloalkyl of 3 to 10 carbon atoms or cycloalkyl of 3 to 10 carbon atoms substituted with 1 to 4 halogen atoms of atomic number 17 to 35; R is hydrogen, alkyl of 1 to 10 carbon atoms, alkyl of 1 to 10 carbon atoms substituted with 1 to 4 halogen atoms of atomic number 17 to 35, cycloalkyl of 3 to 10 carbon atoms or cycloalkyl of 3 to 10 carbon atoms substituted with 1 to 4 halogen atoms of atomic number 17 to 35.

2. Compound of Claim 1 wherein R is phenyl or phenyl substituted with 1 to 4 halogen atoms of atomic number 9 to 35, nitro groups, alkyl groups individually of 1 to 4 carbon atoms or alkoxy groups individually of 1 to 4 carbon atoms with the proviso that when R is phenyl substituted with alkyl or alkoxy the alkyl or alkoxy substituent will be in position 2, 4 or 6 of the benzene nucleus.

3. Compound of Claim 1 wherein R is phenyl or phenyl substituted with 1 to 4 halogen atoms of atomic number 9 to 35 or nitro groups, R is hydrogen or alkyl of 1 to 2 carbon atoms, R is hydrogen or alkyl of 1 to 2 carbon atoms, R is alkyl of 1 to 6 carbon atoms substituted with 1 to 4 halogen atoms of atomic number 17 to 35, cycloalkyl of 3 to 6 carbon atoms or cycloalkyl of 3 to 6 carbon atoms substituted with 1 to 4 halogen atoms of atomic number 17 to 35, R is hydrogen, alkyl of 1 to 6 carbon atoms substituted with 1 to 4 halogen atoms of atomic number 17 to 35, cycloalkyl of 3 to 6 carbon atoms or cycloalkyl of 3 to 6 carbon atoms substituted with 1 to 4 halogen atoms of atomic number 17 to 35.

4. Compound of Claim 1 wherein R is hydrogen or methyl, R is alkyl of 1 to 2 carbon atoms, R is alkyl of 1 to 4 carbon atoms substituted with 0 to 2 halogen atoms of atomic number 17 to 35, R is hydrogen or alkyl of 1 to 4 carbon atoms substituted with 0 to 2 halogen atoms of atomic number 17 to 35 or cycloalkyl of 3 to 6 carbon atoms substituted with 0 to 2 halogen atoms of atomic number 17 to 35 5. Compound of Claim 1 wherein R is phenyl or phenyl substituted with 1 to 2 halogen atoms of atomic number 9 to 35 or nitro groups, R is hydrogen or alkyl of 1 to 2 carbon atoms, R is alkyl of 1 to 2 carbon atoms, R is alkyl of 1 to 4 carbon atoms, R is hydrogen or alkyl of 1 to 4 carbon atoms or cyclohexyl.

6. Compound of Claim 1 wherein R is phenyl substituted with 1 to 2 halogens of atomic number 9 to 35, R is hydrogen, R is methyl, R is methyl, and R is hydrogen, alkyl of 1 to 4 carbon atoms or cyclohexyl.

3,824,281 9 10 7. Compound of Claim 6 wherein R is 3,4-dichloro- 13. l-Methyl 1 (N-methylpropylamidothio)-3-(2- phenyl, R and R are hydrogen, and R and R are fluorophenyl) urea, according to Claim 6. methyl.

8. Compound of Claim 6 wherein R is Z-fiuorophenyl, References Cited R is hydrogen, and R, R and R are methyl. UNITED STATES PATENTS 9. Compound of Claim 6 wherein R is 2-fiuorophenyl, 5 3 202 571 8/1965 B R is hydrogen, R and R are methyl, and R is cyclooogaart 260-545 X hexyl. y y

10. l-Methyl-l-(N-methylbutyramidothio)-3-(2-fiuoro- LORRAINE W Q Primary Exammer phenyl) urea, according to Claim 6. 10 R. GE'RSTL, Assistant Examiner 11. l-Methyl-1-(N-methylformamidothio)-3-(2 fluorophenyl) urea, according to Claim 6. Cl- X:R-

ly 1- y 71-88, 94, 9s, 9s; 260--239.3 R, 293.75, 326.3. 543.7 phenyll urea, according to Claim 5.

UNITED STATES PATENT AND TRADEMARK QFFICE CERTIFICATE (PF CGRREC'EHEN July 16, 1974 MELANCTHON 5. BROWN & GUSTAVE K. KOHN PATENT NO.

DATED INVENTOR(S) I H i; certifia d that 8H0? in aboveti antified paient ana ihat Paiens are hereby corrected as shown below:

Col. 1, line 4, after "Berkeley, Calif." insert -and Gustave K, Kohn,-.

Signed and Sealed this sixteenth Day of September 1975 [SEAL] Arrest.

RUTH C. MASON Arresting Officer C. MARSHALL DANN Commissioner oj'Palents and Trademarks 

